Natural-sorbent attrition and elutriation characteristics in fluidized-bed coal combustors
Laboratory test methods have been developed to measure the attrition and elutriation characteristics of limestones in an atmospheric-pressure fluidized-bed coal combustor (AFBC) at 850/sup 0/C. The attrition constant and elutriation rate were determined for a group of limestones when the system is assumed to be at steady state; that is, after sorbent breakup due to thermal shock and decrepitation during calcination of the sorbent feed are completed. An attrition model has been developed to analyze the laboratory data to predict sorbent performance in AFBCs. The attrition model assumes that the particle disintegration occurs from the abrasive removal of material from the surface of the particle rather than by particle fracture. The attrition constants of the limestones tested ranged from 1.5 x 10/sup -6/ sec/sup -1/ to 9.2 x 10/sup -8/ sec/sup -1/, and the elutriation rate had a fractional mass loss which ranged from 8.1 x 10/sup -8/ min/sup -1/ to 1.0 x 10/sup -3/ min/sup -1/. The test methods and techniques utilized by the model are undergoing refinement to improve the accuracy of the prediction. The attrition and elutriation of a sorbent in a fluidized-bed combustor affects the sorbent performance in a complex manner. The obvious case is the extreme situation where so much sorbent material is lost from the bed via attrition and elutriation that a constant bed height cannot be maintained. Because this aspect is an important consideration in sorbent selection, standard laboratory test methods have been developed to measure the attrition and elutriation characteristics of limestones in AFBCs.
- Research Organization:
- Argonne National Lab., IL (USA); Ohio State Univ., Columbus (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6413737
- Report Number(s):
- CONF-8104190-2; ON: DE83010557
- Country of Publication:
- United States
- Language:
- English
Similar Records
Agglomeration of sorbent and ash carry-over for use in atmospheric fluidized-bed combustors
Attrition and elutriation phenomena in industrial atmospheric fluidized bed combustors
Related Subjects
014000* -- Coal
Lignite
& Peat-- Combustion
ADSORBENTS
BENCH-SCALE EXPERIMENTS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
COMPARATIVE EVALUATIONS
DATA
ELUTRIATION
ENERGY SOURCES
EROSION
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
INFORMATION
LIMESTONE
MATERIALS
NUMERICAL DATA
OXIDATION
ROCKS
SEDIMENTARY ROCKS
SEPARATION PROCESSES
TESTING
THERMOCHEMICAL PROCESSES